Based on the new details in the question:
Instead of creating a separate “type2” post type, you could:
- Put all the data together in the “type1” post
- Have the “type2” permalink (example.com/taxonomy/type1/type2/) redirect to: example.com/taxonomy/type1/?type=type2 (you can make this query string whatever you want, but the gist is, redirect to a query string version of the “type1” permalink). You should be able to code this to a post status hook – whenever a post status changes to ‘publish’, if the post type is ‘type1’, add a wp_redirect from the URL structure you want people to type in to the query string version.
- Make the “type1” template conditional. Use an if statement: if there is a $_GET request where type=type2, show the type2 content; else, show the type1 content.
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